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[[Quadrature]] encoders are nowadays the most common feedback device type in servo motors. Quadrature encoders are incremental sensors so they require position zeroing/homing to get absolute position feedback. | [[Quadrature]] encoders are nowadays the most common feedback device type in servo motors. Quadrature encoders are incremental sensors so they require position zeroing/homing to get absolute position feedback. | ||
− | Another type of encoder is ''absolute encoder''. Absolute encoders typically output serial data of absolute position thus they may not need to be zeroed (in case of multiturn absolute encoders). The drawback of absolute sensors is typically higher price and lower compatibility & interchangeability | + | Another type of encoder is ''absolute encoder''. Absolute encoders typically output serial data of absolute position thus they may not need to be zeroed (in case of multiturn absolute encoders). The drawback of absolute sensors is typically higher price and lower compatibility & interchangeability. |
*[[Wikipedia:Rotary encoder]] | *[[Wikipedia:Rotary encoder]] | ||
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Resolver is an analog technology based on rotary transformer that can provide absolute position (single turn absolute, for multiturn absolute position zeroing is still needed). Resolvers are good for harsh conditions but they don't provide as high precision feedback data as encoders. | Resolver is an analog technology based on rotary transformer that can provide absolute position (single turn absolute, for multiturn absolute position zeroing is still needed). Resolvers are good for harsh conditions but they don't provide as high precision feedback data as encoders. | ||
− | * | + | *[[Wikipedia:Synchro]] |
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===Tachometer=== | ===Tachometer=== | ||
Tachometer is a small DC generator that outputs DC voltage proportional to rotation speed. It can be used as velocity feedback device but not as position sensor. Tachometers are often seen in dual-loop configurations combined with position sensor. | Tachometer is a small DC generator that outputs DC voltage proportional to rotation speed. It can be used as velocity feedback device but not as position sensor. Tachometers are often seen in dual-loop configurations combined with position sensor. | ||
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| Absolute encoder | | Absolute encoder | ||
| Medium | | Medium | ||
− | | Serial | + | | Serial, [http://en.wikipedia.org/wiki/Gray_code Gray signals] |
| Yes (single or multiturn) | | Yes (single or multiturn) | ||
| Medium to very high | | Medium to very high | ||
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*[[Resolution of motors]] | *[[Resolution of motors]] | ||
*Extensive article about different types of feedback devices: http://www.optoresolver.com/help/glossary.htm | *Extensive article about different types of feedback devices: http://www.optoresolver.com/help/glossary.htm | ||
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